8507721541 has 4 divisors (see below), whose sum is σ = 9281150784. Its totient is φ = 7734292300.

The previous prime is 8507721539. The next prime is 8507721559. The reversal of 8507721541 is 1451277058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8507721541 - 2¹ = 8507721539 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8507721494 and 8507721503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8507721511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386714605 + ... + 386714626.

It is an arithmetic number, because the mean of its divisors is an integer number (2320287696).

Almost surely, 2^8507721541 is an apocalyptic number.

It is an amenable number.

8507721541 is a deficient number, since it is larger than the sum of its proper divisors (773429243).

8507721541 is a wasteful number, since it uses less digits than its factorization.

8507721541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773429242.

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 8507721541 is about 92237.3110026523. The cubic root of 8507721541 is about 2041.4453377942.

Adding to 8507721541 its reverse (1451277058), we get a palindrome (9958998599).

The spelling of 8507721541 in words is "eight billion, five hundred seven million, seven hundred twenty-one thousand, five hundred forty-one".